Tatung VM9K9DA Service Manual
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Tatung VM9K9DA Service Manual

Tatung VM9K9DA Service Manual

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SERVICE MANUAL
COLOR MONITOR
VM9K9DA

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Summary of Contents for Tatung VM9K9DA

  • Page 1 SERVICE MANUAL COLOR MONITOR VM9K9DA...
  • Page 2 THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS LIABILITY FOR CHANGES, ERRORS OR OMISSIONS, MANUFACTURE DATE : AUGUST.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS PAGE 1. SPECIFICATIONS ..................... 2. PRECAUTION AND NOTICES ................2-1 SAFETY PRECAUTIONS ................2-2 PRODUCT SAFETY NOTICE ............... 2-3 SERVICE NOTES ................... 2-4 HIGH VOLTAGE WARNING ............... 3. OPERATING INSTRUCTIONS ................4. ADJUSTMENT ......................4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS ....... 4-2 MAIN ADJUSTMENTS .................
  • Page 4 1. SPECIFICATIONS FOR 9Klr SERIES COLOR MONITOR CRT : 48.2CM(19") 90 Deflection, 29mm Neck, Pure flat 0.25mm Dot Pitch, Non-Glare Screen Viewable image Size: 45.7CM (18") diagonal Display Color: Unlimited Colors External Controls: Power On/Off, OSD key, Function knob: Contrast, Brightness, H-Size, H-Center, V-Size, V-Center, ZOOM, Pincushion, Trapezoid, Pin-Balance, Parallelogram, Rotation, Moire Reduce, Recall, Degaussing, Color Temperature, Volume.
  • Page 5 11. Power Source: Switching Mode Power Supply AC 100 ~240V, 50/60Hz Universal Type 12. Operating Temperature: 0°C to 40°C Ambient 13. Humidity : 10% to 85% Relative, Non-Condensing Weight: 20.0 Kgs(Net), 23.6Kgs(Gross) for 9Klr • Dimensions Monitor: Carton: 570(W) × 545(H) × 655(D) mm Monitor: 436(W) ×...

  • Page 6: Precaution And Notices

    2. PRECAUTIONS AND NOTICES SAFETY PRECAUTIONS Observe all caution and safety related notes located inside the display cabinet. Operation of the display with the cover removed, may cause a serious shock hazard from the display power supply. Work on the display should not be attempted by anyone who is not thoroughly familiar with precautions necessary when working on high voltage equipment.

  • Page 7: High Voltage Warning

    HIGH VOLTAGE WARNING Operation of monitor outside of cabinet or with back removed may cause a serious shock hazard. Work on this model should only be performed by those who are thoroughly familiar with precautions necessary when working on high voltage equipment. Exercise care when servicing this chassis with power applied.

  • Page 8: Operating Instructions

    3. OPERATING INSTRUCTIONS This procedure gives you instructions for installing and using the 9K color display. Position the display on the desired operation and plug the power cord into a convenient AC outlet. Three- wire power cord must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical conduit ground.

  • Page 9: Adjustment

    4. ADJUSTMENT 4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS Approximately 30 minutes should be allowed for warm up before proceeding. Adjustments should be undertaken only on those necessary elements since most of them have been carefully preset at the factory. 4-2 MAIN ADJUSTMENTS FUNCTION LOCATION DESIGNATION...
  • Page 10 FACTORY PRESET H: 36.51kHz V: 51.34Hz 6500 9300 CONTRAST H-MOIRE REDUCE BRIGHTNESS V-MOIRE REDUCE H-CENTER R-GAIN H-SIZE G-GAIN V-CENTER B-GAIN V-SIZE R-BIAS ZOOM G-BIAS TOP COMER R-BIAS BOTTOM COMER COLOR TEMPERATURE 9300 PINCUSHION 6500 COLOR TEMPERATURE TRAPEZOID DEGAUSS PIN-BALANCE OSD EXIT PARALLELOGRAM RETURN ROTATION...
  • Page 11 E. To switches the input signal to the other Timing Mode. Please follow step C ~ D to get the optimum picture. F. Select the " " RETURN function and press the MENU Key, then the Factor Preset window will be returned to the original OSD window.(user's operating condition) G.

  • Page 12: Circuit Description

    RELATIVE PLACEMENT OF TYPICAL COMPONENTS Purity Magnets 6-pole Convergence Magnets 4-pole Convergence Magnets Deflection Yoke 6. Convergence adjustment A. Produce a magenta crosshatch on the display. B. Adjust the focus for the best overall focus on the display. Also adjust the brightness to the desired condition. C.
  • Page 13 On Screen Display Controller The IC802 is designed for display the built-in characters or fonts onto monitor screen. The display operation is by transforming data and control information from micro controller to RAM through a serial data interface. Pin2 is used to control the internal oscillator frequency by DC voltage input from external low pass filter (R830, C817, R833) and filter (R126, C115) is used to regulate the appropriate bias current for internal oscillator the resonate at specific dot frequency.
  • Page 14 5-3 TRANSISTOR & DIODE CIRCUIT LOCATION FUNCTION AL DESCRIPTION D101 For C102 Discharge Q101 For LED Indicator Control D418 Protection Diode for Snubber Clip Diode ZD401 D431 Protection Diode for B+ Control D405 Speed up for Q403 D406 Supply a bias for D408 D408 Damping Diode and Modulation Diode Q416...
  • Page 15 LOCATION FUNCTION AL DESCRIPTION D706,D708 Rectifier for -200V Supply Q707 Picture Mute Control AMP Q703, Q706 Brightness Control CKT Q708 Vertical Dynamic Focus Control AMP D901 ~ D904 Bridge Rectifier for AC Source D910 Clip Diode for Snubber CKT D911 IC901 VCC Supply D913 Speed UP for Q901...

  • Page 16: Trouble Shooting Chart

    6.TROUBLE SHOOTING CHART 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS CHECK MAIN PCB POWER SUPPLY 60.5V, 14.5V, 80V CHECK POWER SAVING CIRCUIT, H-SYNC, V-SYNC SIGNAL CHECK THE HIGE VOLTAGE REFER ITEM S.M.P.S. 26.5~27.5K OF CRT ABOUT 25.5 ~ 26.5KV CHECK FAILSAFE CKT IC401 PIN 2 RELATIVE CKT.
  • Page 17 2.ABNORMAL VIDEO LEVEL ON SCREEN CHECK THE VOLTAGE OF IC801 7,15.18,21 ABOUT 12V PIN 6, 9, 22 ABOUT 12V CHECK 12V RELATIVE CIRCUIT CHECK THE SIGNAL INPUT OF R.G.B. ABOUT 0.7Vpp CHECK SIGNAL CABLE OR INTERFACE CARD. CHECK IC801 PIN 15 CLAMP PULSE PIN 16 BLANK PULSE CHECK THE IC105 RELATIVE CIRCUIT OR IC401 PIN 16 OUTPUT...

  • Page 18: Abnormal Display

    6-2 ABNORMAL DISPLAY 1.NO SIGNAL ON SCREEN CHECK VIDEO IC801 VCC ABOUT 12V CHECK THE 12V PIN OF P802 CONNECTOR CHECK THE OUTPUT VOLTAGE OF IC801 PIN 18, 20, 23 ABOUT 3Vpp 16,19,22 CHECK THE RELATIVE CIRCUIT OF IC801 CHECK THE B+ VOLTAGE OF VIDEO PCB ABOUT 80V CHECK THE 80V RELATIVE CIRCUIT OF SMPS ON MAIN PCB...

  • Page 19: Blanking

    6-3 NO BLANKING CHECK THE RELATIVE CIRCUIT OF BLANKING CHECK THE RELATIVE CIRCUIT OF C433, D410, R635, R636, IC105 ON MAIN PCB CHECK IC801 PIN 16 ON VIDEO PCB, CHECK G1 RELATIVE CIRCUIT Q705, R718, C707 ON MAIN PCB 6-4 HOR./OSC/DEF/HV CIRCUIT FAULT 1.

  • Page 20: Abnormal Horizontal Deflection

    6-5 ABNORMAL HORIZONTAL DEFLECTION 1. ABNORMAL HORIZONTAL WIDTH OF VIDEO READJUST H-WIDTH FUNCTION CHECK THE RELATIVE CIRCUIT OF Q404, Q405, & Q406 CHECK FBT B+ VOLTAGE ABOUT 60.5V AT FH=31KHz CHECK THE RELATIVE CIRCUIT OF SMPS. Q911, Q912, Q914, Q915 & IC401 PIN 4, 5, 6, VR 902 CHECK THE HV OF CRT ABOUT 26KV...

  • Page 21: Abnormal Vertical Scanning

    6-6 ABNORMAL VERTICAL SCANNING 1. ABNORMAL VERTICAL SIZE READJUST V-SIZE FUNCTION VALUE CHECK THE IC601 PIN 7 ABOUT 40V CHECK ZD601, ZD602 R626 & SMPS RELATIVE CIRCUIT CHECK VERT. OSC CIRCUIT CHECK IC401 PIN 22, 23, 24 CHECK IC601 PIN 6 OUTPUT ABOUT CHECK IC401 PIN 12, 13 38Vpp RELATIVE CIRCUIT...

  • Page 22: Poor Focus

    6-8 POOR FOCUS READJUST FOCUS CONTROL CHECK FOCUS CONTROL UNIT, FOCUS LEAD WIRE, CRT SOCKET & CRT 6-9 NO SOUND (FOR AUDIO MODEL ONLY) CHECK IC501 ADJUST VOLUME CONTROL PIN 14 ABOUT 14V CHECK POWER SUPPLY CIRCUIT ENSURE THE SOUND SOURCE IS POWER ON CHECK IC501 IC501 FAILURE...

  • Page 23: Power Supply Trouble Shooting Chart

    6-10 POWER SUPPLY TROUBLE SHOOTING CHART BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 60.5V - 145V (DEPENDING EPENDING UPON H.SYNC FREQUENCY) CONSTANT OUTPUT : 6.3V, 14.5V, 55V, 80V BEAD SET ABNORMAL VARIABLE OUTPUT MAKE SURE THAT CHECK AC LINE...

  • Page 24: Mechanical Of Cabinet Front Dis-Assembly

    7. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY...

  • Page 25: Parts Listing

    PARTS LIST OF CABINET LOCATION PART NUMBER SPECIFICATION Remork P990SAIWSSN1L 2T 19" COLOR MONITOR CK790S KEPC BOARD FOR P790S-1 CM988S1PFC CHASSIS FOR P990S-1L 1A6003- 21-128 CRT SCREW 5A 38- 8 RUBBER WASHER 11A 112- 1 WIRE MOUNTS 11A 112-500 WIRE MOUNT 11A 115- 1 FBT CLIP 12A 385- 1...
  • Page 26 750A1697- 77 0.5*80Ts degaussing coil 750A5408-1AV 19" HITACHI CRT CK790S KEPC BOARD FOR P790S- 715A 757- 1 P.C.BRD E601 77A 700- 1- F ENCODER E601 77A 700- 1- ST RE11CT-V1Y12-MF2AS H601 95A8013- 5-514 WIRE HAMESS R191 61A 602-822-52T 8.2K OHM +-5% 1/6W CM988S1PF CHASSIS FOR P990S-1L AIM988S1...
  • Page 27 C431 64A100J-225- 59 2.2UF/100V MEF C438 63A210J-104-2CC 0.1UF +-5% 250V ³Í·ù¤½¥q C439 63A210J-474-2CC 0.47UF/250V C439 63A210J-474-2CM 0.47UF 5% 250V PMH MYLAB C449 65A 2K-181- 5A 180PF +-10% Y5P 2KV C450 65A 2K-101- 5A 100P 2KV C453 63A210J-274-2CC .27UF +-5% 250V C458 63A210J-683-2CC 0.068UF 250V...
  • Page 28 IC401 56A 552- 2 TDA4841PS/PHILIPS IC403 56A 212- 2 QUAD.OP.LM324N 14P IC/S. IC403 56A 212-501 HA17324/HITACHI IC404 56A 212- 2 QUAD.OP.LM324N 14P IC/S. IC404 56A 212-501 HA17324/HITACHI IC901 56A 379- 9 8P IC KA3842A/SAMSUNG IC901 56A 379- 12 8PIN IC UC3842AM/LIN J036 95A 90- 23 TIN COATED...
  • Page 29 R927 61A153M-333- 59 33K OHM +-5% 3W R929 61A 20K-278-GB1 0.27 OHM 10% 2W CEMENT R R955 61A 301-228- 64 0.22 OHM 5% 1/2W R964 61A152M-150- 64 15 OHM 5% 2W • R968 61A152M-150- 64 15 OHM 5% 2W R969 61A214Y-473- WT 1/4W 47K R975...
  • Page 30 C402 64A700J-822-0AT 8200PF/50V +-5% C403 64A 45G-103-1AT .01UF +-2% 100V C404 64A176J-472- 1T 0.0047UF +-5% 100V C407 65A 442-101-13T 100PF +-5% NPO 50V C408 63A212J-473-2AT 0.047 250V +-5% C408 64A176J-473- 2T 0.047UF 5% 250V MPE C409 67A 309-100- 7T 10UF +-20% 50V C410 65A 442-470- 9T 47pF/50V SL...
  • Page 31 C906 65A 444-681- 1T 680P/50V C916 67A 305-101- 4T 100UF +-20% 25V C918 64A176J-332- 1T 0.0033UF 5% 100V C918 64A700J-332-0AT 3.3nF/50V +-5% C919 64A176J-102- 1T .001UF +-5% 100V C919 64A700J-102-0AT PEN 0.001UF/50V +-5% C920 65A 444-102- 5T 1000 PF 10% 50V Y5P C921 64A176J-104- 0T 0.1UF 5% 63V...
  • Page 32 D425 93A 64- 11-52T DIODE 1N4148 D430 93A 64- 11-52T DIODE 1N4148 D431 93A 64- 11-52T DIODE 1N4148 D704 93A1060- 6-52T F R D BYV26C D704 93A1060- 6G-52T UF4005 G.I D705 93A 60-21P-52T PS156R D705 93A 60-21W-52T FR155/WILLAS D706 93A1060- 6-52T F R D BYV26C D707 93A 64- 11-52T...
  • Page 33 Q426 57A 419- SG- T KSC945C-G TA FAIRCHILD Q427 57A 721- 1- T DTC114ES ROHM Q701 57A 419- P- T TRAN 2SC945P/NEC TAPING Q701 57A 419- SG- T KSC945C-G TA FAIRCHILD Q702 57A 420- P- T TRAN 2SA733P/NEC TAPING Q702 57A 420- SG- T KSA733C-G TA FAIRCHILD Q703...
  • Page 34 R405 61A 210-163-52T 16K OHM 1% 1/6W R406 61A 602-102-52T 1K OHM 5% 1/6W R407 61A 602-103-52T 10K OHM 5% 1/6W R408 61A 172-472-52T 4.7K OHM 5% 1/4W R409 61A 172-562-52T 5.6K OHM 5% 1/4W R410 61A 602-221-52T 220 OHM +-5% 1/6W R411 61A 172-104-52T 100K OHM +-5% 1/4W...
  • Page 35 R603 61A 602-101-52T 100 OHM 5% 1/6W R604 61A 602-101-52T 100 OHM 5% 1/6W R608 61A 210-223-52T 22K OHM 1% 1/6W R610 61A 602-221-52T 220 OHM +-5% 1/6W R620 61A 602-102-52T 1K OHM 5% 1/6W R621 61A 602-102-52T 1K OHM 5% 1/6W R626 61A175L-681-52T 680 OHM 5% 1/2W...
  • Page 36 R933 61A212Y-473- WT 47K OHM 5% 1/2W R934 61A 172-102-52T 1K OHM 5% 1/4W R935 61A 172-154-52T 150K OHM 5% 1/4W R936 61A 172-222-52T 2.2K OHM 5% 1/4W R937 61A 172-101-52T 100 OHM 5% 1/4W R938 61A 172-220-52T 22 OHM 5% 1/4W R939 61A 172-203-52T 20K OHM 5% 1/4W...
  • Page 37 AIR988S12 CRT BOARD FOR S990S-1 40A 581- 26-605 LABEL 55A 1- 4 SOLDER BAR 87A3504- 2 17" D.F. CRT SOCKET META 87A3504- DL CRT SOCKET 87A3504- LW CRT DOCKET CICBB09122 705A990S-R56- 01 IC803 ASS'Y FOR P990S-1 C852 65A 450-104- 7T 0.1UF +80-20% 50V Y5V C860 65A 450-104- 7T...
  • Page 38 C853 67A 70-109- 9T 1UF/100V C854 67A 70-109- 9T 1UF/100V C855 67A 70-109- 9T 1UF/100V C856 67A 309-109- 9T 1UF +-20% 100V C857 67A 309-109- 9T 1UF +-20% 100V C858 67A 309-109- 9T 1UF +-20% 100V C859 65A 450-104- 7T 0.1UF +80-20% 50V Y5V C861 65A 450-104- 7T...
  • Page 39 L851 73A 54-478-10T 0.47UH +-10% peaking coi L852 73A 54-478-10T 0.47UH +-10% peaking coi Q801 57A 744- 2- T BFQ221 Q802 57A 744- 2- T BFQ221 Q803 57A 744- 2- T BFQ221 Q850 57A 493- 10- T TRANSISTOR BF422/PHLIPS Q851 57A 493- 10- T TRANSISTOR BF422/PHLIPS Q852...
  • Page 40 R866 61A 602-103-52T 10K OHM 5% 1/6W R867 61A 602-103-52T 10K OHM 5% 1/6W R868 61A 602-103-52T 10K OHM 5% 1/6W R869 61A 172-101-52T 100 OHM 5% 1/4W R870 61A 172-101-52T 100 OHM 5% 1/4W R871 61A 172-101-52T 100 OHM 5% 1/4W R873 61A175L-101-52T 100 OHM +-5% 1/2W...
  • Page 41 R907 61A 20K-478-GE1 0.47 5W PFC988SAI PFC AI ASS'Y 715A 782- 2A PFC BOARD D906 93A 64-31G-52T BAV20 D906 93A 64-31T-52T BAV20 FB902 71A 55- 19- T BEAD R906 61A 172-153-52T 15K OHM 5% 1/4W R908 61A 172-473-52T 47K OHM 5% 1/4W R909 61A214Y-105- WT 1M OHM 1/4W...
  • Page 42 51A 200- 1 Coolant 90A 348- 6- 3A HEAT SINK M1A1730- 10-128 SCREW M3x10 • Q901 57A 723- 3B 2SK2761-01MR 705A990SC57 0 Q425 ASS'Y 90A 360- 2 HEAT SINK M1A1730- 8-128 SCREW M3x8 Q425 57A 728- 1 2SB772 Q/NEC Q425 57A 728- 3 HSB772P/HSB772E HI-SINCE 705A990TC57 0...
  • Page 43 Bias Adjust IC803 Q850~Q852 LM2437...

  • Page 44: Ic Block Diagrams

    10. IC BLOCK DIAGRAM IC403/IC404 IC101 LM324 UM6861 DAC2 VSYNC1/INTV OUTPUT 1 OUTPUT 4 INVERTING INVERTING DAC1 HSYNC1 INPUT 1 INPUT 4 NON-INVERTING NON-INVERTING DAC0 DAC3 INPUT 1 INPUT 4 RESET_ DAC4 NON-INVERTING NON-INVERTING DAC5 INPUT 2 INPUT 3 INVERTING INVERTING DAC6 INPUT 2...
  • Page 45 IC401 TDA4856/41 IC401 TDA4856 EW-OUTPUT V-SYNC INPUT VERTICAL EHT COMPENSATION V-OUTPUT V-SYNC H-PINCUSHION AND POLARITY OSCILLATOR INTEGRATOR H-SIZE AND V-SIZE H-CORNER CORRECTION AND AGC V-LINEARITY H-TRAPEZIUM V-LINEARITY BALANCE H-SIZE VIDEO V-POSITION CLAMPING V-SIZE,VOVSCN AND V-BLANK HUNLOCK OUTPUT PROTECTION OUTPUT ASYMMETRIC AND SOFT START EW-CORRECTION I C-BUS...

  • Page 46: Block Diagram (Deflection)

    IC801 TDA4866 GUARD GUARD FLYBACK CIRCUIT GENERATOR AMPLIFIER A OUTA PROTECTION INPUT STAGE FEEDB AMPLIFIER B OUTB IC901 3842 SET/ Vref Vref RESET U.V.L.O. INTERNAL LOGLC BIAS 1/2 Vref C.S. COMP COMP. LATCH OSCILLATOR Ct/Rt...
  • Page 47 NT6828 Block ROM/RAM DISPLAY FONT12*8 EFFECT VERTICA R/G/ VSYNC OUTPUT DISP FBKG CONTROL HSYNC CONTROL COLOR REG. CONTROL POWER ON TIMING LOW VOLTAGE GENERATOR PWM0- HORIZONTAL TEST POWER CIRCUI SYSTEM AVCC DGND DVCC...
  • Page 48 H805 CRPC-S769R IC801 P801 C840 R817 R819 H601 TDA4886 C808 R860 R881 100V 1/ 4 W 120K D803 (NC) 1/ 4 W C802 1/ 4 W 1N4148 CMPC-P990S R807 R818 C809 D856 Q850 OSD-R F/ R 1 C856 BF422 R805 1N4148 R808 R802...

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